NEW YORK (

TheStreet

) -TheStreet Ratings' stock model upgraded

MTS Systems

(MTSC) - Get Report

to 'Buy' from 'Hold'. Net income at this $554 million market cap, industrial sensor company rose to $8.6 million in fiscal fourth quarter compared to a loss of $3.0 million in the same quarter last year.

TheStreet Ratings released rating changes on 14 U.S. common stocks for November 18, 2010. In total, six stocks were downgraded and eight stocks have been upgraded by our stock model.

In the fourth quarter, gross revenue at MTS Systems increased by 12.8% to $105.9 million in fiscal fourth quarter when compared to the same quarter last year. Learn more about Applied Materials:

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$846 million market cap, oil & gas explorer,

Gulfport Energy Corp

(GPOR) - Get Report

was upgraded to 'Buy' from 'Hold'. In third quarter results, Gulfport Energy gross revenue increased by 50% to $33.3 million while the company's bottom line improved by 90% to a profit of $12.7 million compared the year earlier quarter. Learn more about Gulfport Energy:

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-- Reported by Kevin Baker in Jupiter, Fla.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.